EP0958486B1 - Anordnung zum messen der richtung des erdmagnetfeldes - Google Patents
Anordnung zum messen der richtung des erdmagnetfeldes Download PDFInfo
- Publication number
- EP0958486B1 EP0958486B1 EP98908018A EP98908018A EP0958486B1 EP 0958486 B1 EP0958486 B1 EP 0958486B1 EP 98908018 A EP98908018 A EP 98908018A EP 98908018 A EP98908018 A EP 98908018A EP 0958486 B1 EP0958486 B1 EP 0958486B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnetic field
- field
- stray
- magnetic
- measuring instruments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/38—Testing, calibrating, or compensating of compasses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C17/00—Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes
- G01C17/02—Magnetic compasses
- G01C17/28—Electromagnetic compasses
- G01C17/30—Earth-inductor compasses
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C21/00—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00
- G01C21/26—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network
- G01C21/28—Navigation; Navigational instruments not provided for in groups G01C1/00 - G01C19/00 specially adapted for navigation in a road network with correlation of data from several navigational instruments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/022—Measuring gradient
Definitions
- the invention relates to an arrangement and a method for measuring the direction of the earth's magnetic field B E near a magnetic interferer with magnetic field direction that changes over time.
- the direction of the earth's magnetic field serves as a reference in many applications for orientations and navigation on and above the earth's surface.
- the reference value is the magnetic north direction, which is the direction of the Horizontal component of the geomagnetic field is defined.
- DMC Digital Magnetic Compass
- the Measurement of the earth's magnetic field falsified by magnetic fields from magnetic device parts or live conductors are generated. As long as these interferers are constant over time or only slowly changing, they can be carried out once or at larger intervals Calibration procedures are compensated.
- a method is known from US Pat. No. 4,539,760, in which a method with a magnetic sensor system equipped vehicle one after the other different, predetermined orientations are brought into space. Out A 3-D correction matrix is used for the position-dependent measured values Compensation for magnetic interference derived. The procedure continues constant disturbances ahead.
- a typical example for this represents a device that contains a magnet that is attached to a fixed Place is mounted, but at this location, for. B. via a gimbal Suspension can move freely in all directions.
- Another example would be a coil through which a variable current flows.
- the invention was therefore based on the object, an arrangement and a Specify procedures with which such an arbitrarily quickly changing magnetic interference source with regard to its influence on the measurement of the Direction of the earth's magnetic field can be eliminated.
- the measurement arrangement is shown schematically in the drawing.
- the two magnetic field measuring devices 1 and 2 are spatially separated, but rigid to one another and to the magnetic interferer m arranged.
- the measuring directions of the two measuring devices are expediently aligned one behind the other or at least parallel to one another.
- the measured values can by suitable coordinate transformation (turning matrices) at any time common direction can be converted.
- the location vectors of the interferer and the measuring devices are included r 0 , r 1 , r 2 designated.
- the field of the interferer in an unknown position with an unknown strength is called a magnetic dipole m considered.
- the measuring devices 1 and 2 are expediently arranged in such a way that the interferer lies in the extension of the measuring direction formed by them. It should not be on the middle level between the two measuring devices, since the measuring information can cancel each other out if the interferer is symmetrical to the measuring devices.
- the position of the dipole in question is irrelevant and what strength it currently has. As long as the two measuring devices work exactly synchronously, it is also irrelevant whether the dipole during the measurement is twisted or otherwise changed. It is only important that both measuring devices during the entire measuring time from unchanged relative Position to one another are exposed to the influence of the same dipole.
- the matrix elements can be in general easily determine from the known design data.
- the device containing the variable dipole must be placed in a fixed position in which the earth's magnetic field B E remains constant.
- the magnetic disturbance variable (dipole) is brought into many different states.
- the magnetic fields are in each of the layers B 1 and B 2 measured and inserted into the above determination equation, which is then used with any known method to solve linear equations according to the unknown matrix elements P 11 ... P 33 and B E is resolved.
- Such a procedure is particularly advantageous if there are also soft magnetic materials in the system which distort the interference fields of the variable interferer.
- the matrix P will then generally no longer be symmetrical, as was assumed in the above consideration.
- the arrangement according to the invention serves primarily to be able to correctly determine the direction of the earth's magnetic field at any time under the influence of a known dipole vector. However, it can obviously also be used for a dipole vector m unknown place r 0 to determine by direction and length by using the above equations instead of the earth's magnetic field B E the dipole vector m is calculated.
- the arrangement described can also be expanded in such a way that more than two measuring devices are provided in an analog arrangement.
- a second or further disturbers known location or in an analogous manner to the above section for further disturbers unknown location their influence on the measurement of the earth's magnetic field B E are eliminated or their dipole vectors accordingly m k and places r k in a systematic extension of the above procedures.
- the position of the magnetized device can be determined by means of three measuring devices in compliance with the above-mentioned conditions according to the invention. Another independent determination equation is assigned to the additional measured value in accordance with the relationships given above.
- the expanded system of equations can be done using methods known per se for the numerical solution of nonlinear equations for the parameter r 0 can be solved.
Landscapes
- Engineering & Computer Science (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Automation & Control Theory (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Electromagnetism (AREA)
- Measuring Magnetic Variables (AREA)
Description
Claims (4)
- Anordnung zum Messen der Richtung des Erdmagnetfeldes
B E in der Nähe eines magnetischen Störers mit zeitlich veränderlicher Magnetfeldrichtung, dadurch gekennzeichnet, daß mindestens zwei Magnetfeldmeßgeräte vorgesehen sind, die jeweils alle drei Vektorkomponenten des GesamtmagnetfeldesB 1,B 2 messen, die Magnetfeldmeßgeräte eine feste, zeitlich unveränderliche Lager 0,r 1,r 2 zueinander und zum Störer aufweisen, die Meßwerte zeitsynchron abrufbar sind und entsprechendB E = (B 1+B 2)/2+P·(B 1-B 2) auswertbar sind, wobei P(r 0,r 1,r 2) die geometrische Lage der Magnetfeldmeßgeräte zueinander und zum Störer beschreibt. - Verfahren zum Messen der Richtung des Erdmagnetfeldes
B E in der Nähe eines magnetischen Störers mit zeitlich veränderlicher Magnetfeldrichtung, dadurch gekennzeichnet, daß
mit mindestens zwei in fester räumlicher Anordnung zueinander und zum Störer angeordneten Magnetfeldmeßgeräten jeweils die drei Vektorkomponenten des GesamtmagnetfeldesB 1,B 2 zeitsynchron gemessen und entsprechendB E = (B 1+B 2)/2+P·(B 1-B 2) ausgewertet werden, wobei P(r 0,r 1,r 2) eine die geometrische Lage der Magnetfeldmeßgeräte zueinander und zu dem Störer beschreibende Matrix ist. - Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Matrix P aus bekannten Konstruktionsdaten bestimmt wird.
- Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die Matrix P durch Messung ermittelt wird, indem das Gesamtgerät in fester räumlicher Lage gehalten und der Störer in möglichst viele unterschiedliche Zustände gebracht wird, in denen die Gesamtmagnetfelder gemessen und daraus ein System linearer Bestimmungsgleichungen gebildet wird.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19704956A DE19704956C1 (de) | 1997-02-10 | 1997-02-10 | Anordnung und Verfahren zum Messen der Richtung des Erdmagnetfeldes |
DE19704956 | 1997-02-10 | ||
PCT/EP1998/000489 WO1998035205A1 (de) | 1997-02-10 | 1998-01-30 | Anordnung zum messen der richtung des erdmagnetfeldes |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0958486A1 EP0958486A1 (de) | 1999-11-24 |
EP0958486B1 true EP0958486B1 (de) | 2003-09-03 |
Family
ID=7819798
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98908018A Expired - Lifetime EP0958486B1 (de) | 1997-02-10 | 1998-01-30 | Anordnung zum messen der richtung des erdmagnetfeldes |
Country Status (5)
Country | Link |
---|---|
US (1) | US6336081B1 (de) |
EP (1) | EP0958486B1 (de) |
AU (1) | AU6617698A (de) |
DE (2) | DE19704956C1 (de) |
WO (1) | WO1998035205A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10026390C1 (de) * | 2000-05-27 | 2001-09-27 | Handelsvertretung Gerd Busse | Verfahren und Richtungsanzeigevorrichtung zur Ermittlung der standortbezogenen Winkelrichtung zu einem Fixpunkt hin |
DE102005017320A1 (de) * | 2004-04-17 | 2005-11-10 | Vectronix Ag | Verfahren zum Schätzen der Genauigkeit azimutaler Ausrichtungen und tragbares Zielgerät |
CN105509737B (zh) * | 2015-11-26 | 2018-03-16 | 哈尔滨工业大学 | 一种不受地磁变化影响的航空运动平台磁干扰补偿方法 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4672565A (en) * | 1981-03-10 | 1987-06-09 | Nippon Soken, Inc. | Direction detecting system for vehicles |
US4497034A (en) * | 1981-08-05 | 1985-01-29 | Nippon Soken, Inc. | Heading detecting apparatus |
US4539760A (en) * | 1982-10-12 | 1985-09-10 | Plessey Overseas Ltd. | Compass |
JPS601510A (ja) * | 1983-06-17 | 1985-01-07 | Honda Motor Co Ltd | 車載地磁気センサの補正方法 |
DE3341347A1 (de) * | 1983-11-15 | 1985-05-23 | Siemens AG, 1000 Berlin und 8000 München | Koppelnavigationsverfahren fuer strassenfahrzeuge und einrichtung zur durchfuehrung des verfahrens |
US4611293A (en) * | 1983-11-28 | 1986-09-09 | Magnavox Government And Industrial Electronics Company | Method and apparatus for automatic calibration of magnetic compass |
US4797841A (en) * | 1983-11-28 | 1989-01-10 | Magnavox Government And Industrial Electronics Company | Method and apparatus for automatic calibration of magnetic compass |
JPS60135814A (ja) * | 1983-12-26 | 1985-07-19 | Nec Corp | 方位検出装置 |
DE3833798A1 (de) * | 1988-10-05 | 1990-04-12 | Bosch Gmbh Robert | Verfahren zur ermittlung des stoereinflusses von verbrauchern auf navigationssysteme |
JPH07101174B2 (ja) * | 1989-01-06 | 1995-11-01 | 日産自動車株式会社 | 車両用方位計 |
GB8906233D0 (en) * | 1989-03-17 | 1989-05-04 | Russell Anthony W | Surveying of boreholes |
JPH03131712A (ja) * | 1989-10-17 | 1991-06-05 | Pioneer Electron Corp | 車載地磁気センサ出力の補正方法 |
US5216816A (en) * | 1990-03-20 | 1993-06-08 | Casio Computer Co., Ltd. | Compass |
JP3316889B2 (ja) * | 1992-02-05 | 2002-08-19 | 株式会社デンソー | 車両用方位検出装置 |
DE19532122C1 (de) * | 1995-08-31 | 1997-02-20 | Leica Ag | Verfahren zur Horizontstabilisierung von Magnetkompassen |
US6192315B1 (en) * | 1997-06-27 | 2001-02-20 | Prince Corporation | Dual-calibrated compass |
-
1997
- 1997-02-10 DE DE19704956A patent/DE19704956C1/de not_active Expired - Fee Related
-
1998
- 1998-01-30 EP EP98908018A patent/EP0958486B1/de not_active Expired - Lifetime
- 1998-01-30 WO PCT/EP1998/000489 patent/WO1998035205A1/de active IP Right Grant
- 1998-01-30 US US09/355,760 patent/US6336081B1/en not_active Expired - Lifetime
- 1998-01-30 DE DE59809487T patent/DE59809487D1/de not_active Expired - Lifetime
- 1998-01-30 AU AU66176/98A patent/AU6617698A/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO1998035205A1 (de) | 1998-08-13 |
DE19704956C1 (de) | 1998-06-18 |
DE59809487D1 (de) | 2003-10-09 |
US6336081B1 (en) | 2002-01-01 |
AU6617698A (en) | 1998-08-26 |
EP0958486A1 (de) | 1999-11-24 |
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